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10.
Mutualistic Networks – External perturbation
The International Union for Conservation of
Nature has evaluated 52,205 species, depicted
here, for their ability to survive

11.
Mutualistic Networks – External perturbation
How to identify the most important
species in the network?

12.
If we identify important species the network will collapse fast
Ranking Species in Mutualistic Networks - Framework
FRAMEWORK: DECONSTRUCTING ECOSYSTEMS
We do not know how these networks are assembled Other strategy
Tear them down
Search for the most efficient way to destruction

13.
PageRank
A node is
important if
linked to
important
nodes
Closeness
Less distance to
others
Ranking Species in Mutualistic Networks - Framework
FRAMEWORK: DECONSTRUCTING ECOSYSTEMS
WHICH
RANKING
? Degree
More
connections
Betweenness
Bottlenecks
Nestedness
Contribution to
nestedness
Eigenvector
Overlap with
leading
eigenvalue of
A

14.
Ranking Species in Mutualistic Networks - Framework
FRAMEWORK: MusRank Ranking algorithm for mutualistic networks
Inspired in a recent work in
econometrics Products

15.
Ranking Species in Mutualistic Networks - Framework
FRAMEWORK: MusRank Ranking algorithm for mutualistic networks
Inspired in a recent work in
econometrics
Active species
Passive species
Importance
Vulnerability
Determined by number and vulnerability of
partners
(Linear)
Bounded by the less important partner
(Non-linear)

21.
Ranking Species in Mutualistic Networks
RESULTS: MusRank PERFORMANCE
Genetic Algorithm
best
RESULT:
The ranking provided by
MusRank outperforms all
others
RESULT:
Reversing Active/Passive roles
do not change results
Robust algorithm
Distance from each ranking to the genetic algorithm
over all dataset (60 networks)

22.
Ranking Species in Mutualistic Networks
Take home message
Mutualistic networks
-mutual benefit interplay
-hundred of species involved
-characteristic features: Degree heterogeneity (Generalists and specialists),
robust core, phylogeny groups, nestedness,…
-Mutualistic interactions are very important for biodiversity manteinance.
Rankig species
-protocol to quantify “lethality” of a ranking
-MusRank: best method to asses species importance in mutualistic networks
WE ARE
IMPORTANT !!
Oh, No!!I’m more important
than you are ! hehehe
Thanks for Your
attention !!